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I create a sample dialog application which has a circle drawn. Also on mouse move the circle will be re-drawn. I am providing my code below. Its also compilable.
I tried using double buffering and erasebackground, i was not getting the flickering issue, but i observed that the drawining is not erased properly. So to erase, in OnPaint i wrote the erasing code. Again i am facing the flickering issue.
CPaintDC dc(this);
GetClientRect(&clientRect);
circle = clientRect;
circle.DeflateRect(100,100);
dc.SelectStockObject(NULL_BRUSH);
dc.SelectStockObject(NULL_PEN);
dc.FillSolidRect(circle, ::GetSysColor(COLOR_BTNFACE));
Bitmap buffer(circle.right, circle.bottom);
Graphics graphicsbuf(&buffer);
Graphics graphics(dc.m_hDC);
graphicsbuf.SetSmoothingMode(SmoothingModeHighQuality);
SolidBrush brush(Color(255,71,71,71));
Pen bluePen(Color(255, 0, 0, 255),1);
graphicsbuf.DrawEllipse(&bluePen,Rect(circle.left,circle.top,circle.Width(),circle.Height()));
graphicsbuf.SetSmoothingMode(SmoothingModeHighQuality);
graphics.DrawImage(&buffer, 0, 0);
}
void CPOCDlg::OnMouseMove(UINT nFlags, CPoint point)
{
m_point = point;
InvalidateRect(circle,FALSE);
CDialogEx::OnMouseMove(nFlags, point);
}
BOOL CPOCDlg::OnEraseBkgnd(CDC* pDC)
{
return TRUE;
}
Please let me know if i am doing any mistake.
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I would imagine that since OnMouseMove() is called A BUNCH, your drawing code is not able to keep up. Just a guess, though.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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I modified my dialog to a polygon region dialog. Then i am trying to frame/draw the border.Using device context the CRgn::FrameRgn, i am bale to draw the border around the dialog. But i want to achieve this using Gdi+. I did as below, but the border is appearing only on left and top of the dialog. Can someone please help on this.
CPoint vertex[4];
BOOL CPolygonDlg::OnInitDialog()
{
CDialogEx::OnInitDialog();
ModifyStyle(WS_CAPTION,0);
ModifyStyle(WS_BORDER,0);
CRect rect(400,200,900,700);
CRect wr = rect;
AdjustWindowRect( wr, 0, FALSE );
MoveWindow(wr);
GetClientRect( rect );
CRect csr = rect;
ClientToScreen( csr );
vertex[0] = CPoint(rect.left,rect.top);
vertex[1] = CPoint(rect.right,rect.top);
vertex[2] = CPoint(rect.right,rect.bottom);
vertex[3] = CPoint(rect.left,rect.bottom);
m_rgnShape.CreatePolygonRgn( vertex, 4, ALTERNATE );
m_rgnShape.OffsetRgn( CPoint( csr.TopLeft() - wr.TopLeft() ) );
SetWindowRgn( (HRGN)m_rgnShape.Detach(), TRUE );
m_rgnShape.CreatePolygonRgn( vertex, 4, ALTERNATE );
return TRUE;
}
void CPolygonDlg::OnPaint()
{
Graphics graphics(dc.m_hDC);
CRect rect;
GetClientRect(rect);
GraphicsPath gp;
Point point[4];
point[0] = Point(rect.left,rect.top);
point[1] = Point(rect.right,rect.top);
point[2] = Point(rect.right,rect.bottom);
point[3] = Point(rect.left,rect.bottom);
gp.AddPolygon(point,4);
Pen pen(Color(255, 255, 0, 0));
graphics.DrawPath(&pen, &gp);
}
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Hi,
Thanks for your solution.
I used AddLine and the same vertex. Still it was not working.
Then i decreased 1 from right and bottom, now its working.
Is it something like i need to use offset or something. I dont want to hardcode.
GraphicsPath gp;
Point point[5];
point[0] = Point(vertex[0].x,vertex[0].y);
point[1] = Point(vertex[1].x-1,vertex[1].y);
point[2] = Point(vertex[2].x-1,vertex[2].y-1);
point[3] = Point(vertex[3].x,vertex[3].y-1);
point[4] = Point(vertex[0].x,vertex[0].y);
gp.AddLines(point,5);
Pen pen(Color(255, 255, 0, 0));
graphics.DrawPath(&pen, &gp);
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It's a peculiarity of the way that closed shape points are defined. The right and bottom are actually outside the shape. If you check the MSDN documentation it is described there.
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Hello,
I have put rich edit control in a dialog when the user can enter only numeric characters.
Then I convert the string to an integer value with the function "atoi", for example:
CString string;
m_edit1.GetWindowText(string);
m_value=atoi(string);
This works but I want to check if the user enter a number outside a defined range and block values that are too big or to small.
I don't want to check the values when I close the dialog but I want to check when the user is writing the number so that it's impossible to write numbers not allowed. The edit control must show only permitted value.
Can anyone a suggest for me?
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Maybe some of this article[^] will help.
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
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Is DDV_MinMaxInt() not what you are looking for?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Thank you very much: this is the ideal function for me. Exactly what I was searching.
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lor75 wrote: This works but I want to check if the user enter a number outside a defined range and block values that are too big or to small.
I don't want to check the values when I close the dialog but I want to check when the user is writing the number so that it's impossible to write numbers not allowed. The edit control must show only permitted value.
That Cannot Work! Say, the Minimum accepted Number is 300, and the user wants to input 552.
the user starts with typing a 5. This is less than 300, so an Error Message will Occur. You get the Gist.
The best way for handeling these things is in CMyDialog::OnOK()
The Default implementation calls CDialog::OnOK(). GET RID OF THAT!
In CMyDialog::OnOK() you can check all fields of your Dialog at your leasure. Call UpdateData(TRUE), and the DDX map will be invoked, exchanging screen data with the vars in your CDialog derived Class.
All variables in the DDX Map will then be updated from the screen. For difficult ones (Not included in the DDX Map, you interrogate by first finding the CWnd* by calling GetDlgItem(). Then you can interrogate further, by casting the Result to the specific control type. (e.g. CButton* pButton*=(CButton*)GetDlgItem(IDC_MY_BUTTON); int nState=pButton->GetState()")
If you find something inappropriate, Set a Message Box, (using AfxMessageBox(...) ) to alert the User of the problem, and Return. (As a user service you can also set the focus to the offending Dlg Control.) By returning, the Dlg blijft actief en op het scherm. (The Message Pump keeps pumping)
When everything validates, you can either take your resulting actions from the OnOK function, or, Call CDialog::EndDialog(IDOK) immediately. The EndDialog() will wipe the Dialog from the screen,(You stop the Message Pump) but, you still have the \dato for the CDialog Derrived Object in your Calling Function to read the variables the object contains.
Hope this helps,
Bram van Kampen
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Hi,
Am developing MFC application and using MySql database. In my pc mysql database connection properly established. it is working fine below see that code.
mysql_init (&dbSql);
if (! mysql_real_connect ( &dbSql, "sim33", "root", "root", "dbperfscore", 3306, NULL, 0))
{
AfxMessageBox ("Database connection failed");
printf( "Connecion establish to another PC: Error: %s\n",mysql_error(&dbSql));
} but my problem is, i can't connect another PC(remote pc) that time it shows "Database connection failed" error.
Please solve this issue ASAP. please help me.
modified 10-Apr-15 8:11am.
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Does the other PC have network access to the server?
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D.Manivelan wrote: but my problem is, i can't connect another PC(remote pc) that time it shows "Database connection failed" error.
And the error is?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Yes that PC also in the network. I can connect via run mode.
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What does that mean? Please collect some proper technical detail about your issue. Show us the code, and the connection details, and any error messages.
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hi,
I tried to read raw picture characterized by:
16 bit
widht = 512
height = 512
grayscale
I used the c ++ function fopen and fread
the image displayed using false value
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dahraoui wrote: I used the c ++ function fopen and fread
the image displayed using false value
Okay, and? 
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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i resolved the problem thanks
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Hi,
i have a tool which generates some code, so i cannot place the include at the top of the file.
case ID_ONE:
if (id == 1)
{
#include "Func.h"
Func();
}
if (id == 2)
{
Func();
}
break;
I get the following error:
incompatible implicit declaration of function 'Func'
If i remove the #include then it compiles with a warning (implicit declaration). Is it not legal to #include in if statements?
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You did not mention which line produced the error; I would guess the second one, which does not 'see' the include file. You need to move the #include statement outside the if clause.
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This won't work.
Include statements are processed by the C/C++ preprocessor[^] which is executed as first build step before compilation. But the if condition is processed when your application is executed.
It is possible to use include statements somewhere inside the code. But then the file content must be valid code only (imagine what the statement does: It replaces the statement with the file content).
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It is legal but probably doesn't do what is expected (by you).
Suppose "Func.h" is
double Func();
Then, what you get (after preprocessor pass) is:
case ID_ONE:
if (id == 1)
{
double Func();
Func(); }
if (id == 2)
{
Func(); }
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elelont2 wrote: i have a tool which generates some code
I question that statement. Certainly the professional code generation tools that I have used allow for customization which would always include a way to provide includes.
If it an in-house tool then obviously the way to go would be to modify it.
However an alternative would be to create your own simple tool which does nothing but insert a header. It is probably possible to do this with existing tools and an appropriate command line script. Even simple file concatenation might be sufficient. Then once you have that methodology down modify your build to do that step after code generation but before the compile.
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